Maps of the Latest Data at Vancouver Island Stations

This figure shows an overview of the current temperature at
each station in our network.

This figure shows an overview of the current wind speed at
each station in our network.

This figure shows the instantaneous wind power density at
each station in our network. These values are not available when
moving the mouse over the station icons.

This figure shows an overview of the current humidity at
each station in our network.

This figure shows an overview of the current rain amount at
each station in our network.

This figure shows an overview of the current insolation at
each station in our network.

This figure shows an overview of the current UV Index at
each station in our network.

Description

These plots are generated once per minute using data from the previous
minute. All of the figures show the locations of active stations with a
diamond. The coastline of the greater Victoria area is shown in black
and water is shaded with a light grey. (the Gorge is very apparent).
We use a method called
Kriging to interpolate
values between stations. Values far away from any station and especially
those in the corners of the figures should be understood to be estimates created
by the interpolation method.

On occasion some sites won't send their data in a timely enough manner. When
this happens the site is excluded from the plot. This may cause the boundary
of the contoured area to be reduced. A brief explanation of each figure
follows, but see this
page for more information. We are experimenting a bit with different
ways of colouring the data to show the most interesting features so these
descriptions may change over time.

To draw the temperature contours one of two fixed
contour intervals is used, either 0.25 °C or 0.5 °C depending on
the size of the difference between the maximum and minimum.

Relative Humidity is plotted with a fixed interval of
10% and a range of 30% to 100%.

Dewpoint temperature is the temperature it is predicted that
an air mass will have to cool to in order to become saturated with water vapour.
Once saturated water will begin to condense onto surfaces in contact with the air.
Surfaces that are colder than the dewpoint temperature can cause condensation to
occur even if the air in bulk has not (yet) dropped to the dewpoint. If the
dewpoint temperature is below 0 °C frost or ice can form on surfaces.
This value is determined using a formula that combines temperature and humidity.
The formula is a simplified fit to a more stringent model of saturation in air.This value is experimental at this time.
We cannot guarantee its accuracy or availability nor can we say with assurance,
ever, what regions will experience the potential for freezing.

Insolation (the amount of the sun's energy
reaching the surface of the Earth as visible light) is measured in watts
per square metre. It is contoured with an interval of 20 Wm-2.
On a typical bright, sunny, summer day the peak insolation is about
1000 Wm-2. This maximum can be increased by clouds that are
nearby but not blocking the sun. These clouds are reflecting light that has
already been reflected from the ground back toward the sensor.
There is no simple way to convert a radiometric measurement of power to a
photometric measure of brightness. Generally however, higher power means
brighter conditions.
This page
(from Wikipedia) has more information.

The UV Index is shown with an interval of one and a
range of zero to 10.
See this page
for more information.

The total rain is shown
(measured in millimetres, mm, since the previous midnight).

Wind speed is plotted with an interval of two
kilometres per hours (kmhr-1). The direction of the wind is
shown with arrows plotted on each observation location. The length of the
arrows is scaled by the range of observed wind speeds.

Wind power density is a measure of the power
available to wind turbines with unit cross-sectional area. The wind
power density is proportional to the cube of the speed.